qdev: rework device properties.

This patch is a major overhaul of the device properties.  The properties
are saved directly in the device state struct now, the linked list of
property values is gone.

Advantages:
  * We don't have to maintain the list with the property values.
  * The value in the property list and the value actually used by
    the device can't go out of sync any more (used to happen for
    the pci.devfn == -1 case) because there is only one place where
    the value is stored.
  * A record describing the property is required now, you can't set
    random properties any more.

There are bus-specific and device-specific properties.  The former
should be used for properties common to all bus drivers.  Typical
use case is bus addressing, i.e. pci.devfn and i2c.address.

Properties have a PropertyInfo struct attached with name, size and
function pointers to parse and print properties.  A few common property
types have PropertyInfos defined in qdev-properties.c.  Drivers are free
to implement their own very special property parsers if needed.

Properties can have default values.  If unset they are zero-filled.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

1 files changed, 7 insertions, 4 deletions

diff --git a/hw/syborg_timer.c b/hw/syborg_timer.c
index 4f5e3a1..cf96c5f 100644
--- a/hw/syborg_timer.c
+++ b/hw/syborg_timer.c
@@ -209,7 +209,6 @@ static void syborg_timer_init(SysBusDevice *dev)
     QEMUBH *bh;
     int iomemtype;
 
-    s->freq = qdev_get_prop_int(&dev->qdev, "frequency", 0);
     if (s->freq == 0) {
         fprintf(stderr, "syborg_timer: Zero/unset frequency\n");
         exit(1);
@@ -230,9 +229,13 @@ static SysBusDeviceInfo syborg_timer_info = {
     .init = syborg_timer_init,
     .qdev.name  = "syborg,timer",
     .qdev.size  = sizeof(SyborgTimerState),
-    .qdev.props = (DevicePropList[]) {
-        {.name = "frequency", .type = PROP_TYPE_INT},
-        {.name = NULL}
+    .qdev.props = (Property[]) {
+        {
+            .name   = "frequency",
+            .info   = &qdev_prop_uint32,
+            .offset = offsetof(SyborgTimerState, freq),
+        },
+        {/* end of list */}
     }
 };